Gilliam County, Oregon — public water systems
At a glance
6 active public water systems are filed under Gilliam County, Oregon in EPA's SDWIS records, together reporting 1,588 people served. The largest is City of Condon, which reports serving 742 people. 3 are community water systems serving people where they live; the other 3 are non-community systems, such as schools, workplaces, campgrounds and gas stations with their own supply.
Dataset updated . Source: EPA SDWIS/ECHO, refreshed quarterly.
Active systems
6
Population served
1.6K
Community systems
3
Groundwater share
100%
How does Gilliam County compare with other Oregon counties?
Gilliam County has the 35th-most active public water systems among the 57 counties listed for active Oregon systems in EPA records; among the 38 with 3 or more systems, the median has 41. Its systems report 1,588 people served in total, the 36th-largest county figure in the state and less than 0.1% of the statewide total. The average system here reports serving 265 people, well below the Oregon average of 1,587. Population figures are what each system reports; people served by more than one system, such as a wholesaler and the town that buys from it, are counted by each.
Where does Gilliam County's drinking water come from?
By primary water source, Gilliam County's active systems draw on groundwater (6, 100%). Overall, all rely mainly on groundwater (including purchased groundwater) and none on surface water, compared with 88% and 12% across Oregon. Groundwater means the system draws its water from wells or springs fed by underground aquifers. The county's largest system, City of Condon, draws primarily on groundwater.
What kinds of water systems operate in Gilliam County?
Gilliam County's active systems break down as 3 community systems (50%), 2 non-transient non-community systems (33%) and 1 transient non-community systems (17%). A community water system serves at least 15 connections used by year-round residents, or regularly serves at least 25 year-round residents. Homes, apartments and mobile-home parks are served by these. A non-transient non-community water system regularly serves at least 25 of the same people for more than six months a year, but not where they live. Schools, factories, office buildings and hospitals with their own supply are typical examples. A transient non-community water system serves places where people do not stay long, such as gas stations and campgrounds, and regularly serves at least 25 people a day for at least 60 days a year. EPA lists their owner types as private (50%), local government (33%) and federal government (17%).
Water systems in Gilliam County
🔒 Create a free account to export CSV| # | Water system | County | Population served | Type | Source |
|---|---|---|---|---|---|
| 1 | Condon, City of | Gilliam | 742 | Community | Groundwater |
| 2 | Arlington City Water Supply | Gilliam | 628 | Community | Groundwater |
| 3 | Columbia Ridge Landfill/Recycl | Gilliam | 80 | Non-transient non-community | Groundwater |
| 4 | Usace Philippi Park | Gilliam | 65 | Transient non-community | Groundwater |
| 5 | Chemical Waste Mgt of Nw Inc. | Gilliam | 40 | Non-transient non-community | Groundwater |
| 6 | Condon Heights Ws | Gilliam | 33 | Community | Groundwater |
Gilliam County water systems: frequently asked questions
How many public water systems are in Gilliam County, Oregon?
EPA's SDWIS records file 6 active public water systems under Gilliam County, Oregon: 3 community systems (50%), 2 non-transient non-community systems (33%) and 1 transient non-community systems (17%).
Who supplies drinking water in Gilliam County, OR?
The largest community water systems filed under Gilliam County are City of Condon (742 people served), Arlington City Water Supply (628 people served) and Condon Heights Ws (33 people served). Which system serves a particular address depends on its service area, which EPA's SDWIS records do not include; a water bill or the local utility can confirm it.
Does Gilliam County's drinking water come from groundwater or surface water?
Of the 6 active public water systems in Gilliam County, all draw mainly on groundwater and none on surface water, counting purchased supplies. The largest system, City of Condon, uses groundwater.
Where can I find a water quality report for Gilliam County?
Each community water system must deliver an annual water quality report, called a Consumer Confidence Report, to its customers by July 1, covering the previous calendar year. 3 community systems are filed under Gilliam County, so the report to look for is the one from the system that supplies your address.
How can I check violations for a water system in Gilliam County?
Open the system's profile from the list on this page. Each profile shows the most recent Safe Drinking Water Act violations in EPA's records, with plain-English labels and whether each one is resolved. For current compliance status, EPA ECHO is the primary source.
More Oregon water systems
About this data
Source: U.S. EPA Safe Drinking Water Information System (SDWIS) and SDWA violation records, via EPA ECHO, as published October 1, 2026 — AquaCensus refreshes it quarterly. See the methodology for how records are matched, cleaned and scored.
Cite as: AquaCensus, “Public water systems in Gilliam County, Oregon”, https://aquacensus.com/water-systems/oregon/gilliam (data as of October 1, 2026).